自定义验证码校验对话框

样式图:

自定义dialog的布局文件layout_code_dialog.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="180dp"    android:layout_height="90dp"    android:layout_gravity="center"    android:background="@drawable/code_view_bg_shape"    android:orientation="vertical"    android:paddingTop="5dp">    <EditText        android:cursorVisible="false"        android:id="@+id/edt_code_input"        android:layout_width="80dp"        android:gravity="center"        android:layout_height="40dp"        android:layout_marginTop="2dp"        android:layout_marginLeft="10dp"        android:background="@drawable/code_view_input_bg_shape"        />    <mchenys.net.csdn.blog.pcbaby_v8_testdemo.view.CodeView        android:id="@+id/code_view"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/edt_code_input"        android:layout_marginLeft="10dp"        android:layout_marginBottom="5dp"        android:layout_marginRight="5dp"        android:layout_toRightOf="@+id/edt_code_input" />    <TextView        android:id="@+id/tv_info"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/code_view"        android:layout_below="@+id/code_view"        android:text="点击图片更换"        android:textSize="10sp" />    <View        android:id="@+id/view_line"        android:layout_width="match_parent"        android:layout_height="1dp"        android:layout_below="@+id/edt_code_input"        android:layout_marginTop="5dp"        android:background="#66666666" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_below="@+id/view_line">        <Button            android:id="@+id/btn_cancle"            android:textSize="15sp"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:background="@android:color/transparent"            android:gravity="center"            android:text="取消" />        <View            android:layout_width="1dp"            android:layout_height="match_parent"            android:background="#66666666" />        <Button            android:id="@+id/btn_sure"            android:textSize="15sp"            android:textColor="#029AFF"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:background="@android:color/transparent"            android:gravity="center"            android:text="确定" />    </LinearLayout></RelativeLayout>

其中背景图片code_view_bg_shape和code_view_input_bg_shape是/drawable目录下创建的shape的xml文件.

分别为:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <solid android:color="#fff" />    <corners android:radius="10dp" /></shape>

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <stroke        android:width="1dp"        android:color="#66666666"        /></shape>

mchenys.net.csdn.blog.pcbaby_v8_testdemo.view.CodeView是一个自定义的验证码控件,代码如下:

package mchenys.net.csdn.blog.pcbaby_v8_testdemo.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Typeface;import android.util.AttributeSet;import android.view.View;import java.util.Random;/** * Created by mChenys on 2015/12/1. */public class CodeView extends View implements View.OnClickListener {    private static final char[] CHARS = {            '2', '3', '4', '5', '6', '7', '8', '9',            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', 'm',            'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'    };    //variables    private String code;    private Random random = new Random();    private int codeLength;//个数    private float fontSize;//字体大小    private Paint mTextPaint;//字体的画笔    private int paddingLeft;//左内边距    private int paddingTop;//上内边距    public void setCodeLength(int codeLength) {        this.codeLength = codeLength;    }    public String getCode() {        return code;    }    public CodeView(Context context) {        this(context, null);    }    public CodeView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public CodeView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        codeLength = 4;        paddingLeft = dp2px(8);        paddingTop = dp2px(5);        mTextPaint = new Paint();        mTextPaint.setAntiAlias(true);        mTextPaint.setStyle(Paint.Style.FILL);        mTextPaint.setTextSize(25);        mTextPaint.setColor(Color.BLACK);        mTextPaint.setTypeface(Typeface.DEFAULT_BOLD);        fontSize = mTextPaint.getTextSize();//字体大小        System.out.println("fontSize px:" + fontSize);        mTextPaint.setTextAlign(Paint.Align.CENTER);//字体居中        code = createCode();//初始化的时候先生存code值,否则调用getCode()方法返回将是null        //设置点击监听        setOnClickListener(this);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        //左右边距+字体的字间距(这里字间距用fontSize代替)        int width = (int) (2 * paddingLeft + (codeLength - 1) * fontSize);        //上下边距+字体的高度        int height = (int) (2 * paddingTop + fontSize);        setMeasuredDimension(width, height);    }    @Override    protected void onDraw(Canvas canvas) {        canvas.drawColor(Color.parseColor("#F2F2F2"));        System.out.println("onDraw code is :" + code);        char[] codeChar = code.toCharArray();        int fontX = 0; //每个字的X坐标        for (int i = 0; i < codeChar.length; i++) {            fontX = (int) (paddingLeft + i * fontSize);            String text = codeChar[i] + "";            canvas.drawText(text, fontX, paddingTop + fontSize, mTextPaint);        }    }    private String createCode() {        StringBuilder sb = new StringBuilder();        for (int i = 0; i < codeLength; i++) {            sb.append(CHARS[random.nextInt(CHARS.length)]);        }        return sb.toString();    }    /**     * dp转px     *     * @param dp     * @return     */    private int dp2px(float dp) {        float density = getContext().getResources().getDisplayMetrics().density;        return (int) (dp * density + 0.5f);    }    /**     * sp to px     */    public int sp2px(float sp) {        float fontScale = getContext().getResources().getDisplayMetrics().scaledDensity;        return (int) (sp * fontScale + 0.5f);    }    //点击回调方法里面处理验证码的更新    @Override    public void onClick(View v) {        code = createCode();//重新生成新的验证码        invalidate(); //刷新界面UI,会调用onDraw方法        if (null != listener) {            listener.OnChange(getCode());//通过自定义的监听接口返回新的验证码给调用者        }    }    //验证码变化的监听器    public interface OnCodeChangeListener {        void OnChange(String code);    }    private OnCodeChangeListener listener;    public void setOnCodeChangeListener(OnCodeChangeListener listener) {        this.listener = listener;    }}

使用例子如下:

/** * Created by mChenys on 2015/11/30. */public class TextActivity extends Activity {    private String inputCode; //用户输入的验证码值    private String verificationCode;//图片显示的验证码值    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_text);    }    public void showCodeView(View view) {        final Dialog dialog = new Dialog(TextActivity.this, R.style.myDialog);        dialog.setContentView(R.layout.layout_code_dialog);        //提示信息        final TextView tvInfo = (TextView) dialog.findViewById(R.id.tv_info);        CodeView codeView = (CodeView) dialog.findViewById(R.id.code_view);        final EditText edtInput = (EditText) dialog.findViewById(R.id.edt_code_input);        //用户输入的验证码        inputCode = edtInput.getText().toString().trim();        //验证码图片显示的code        verificationCode = codeView.getCode();        codeView.setOnCodeChangeListener(new CodeView.OnCodeChangeListener() {            @Override            public void OnChange(String code) {                //点击验证码图片需要更新code值                verificationCode = code;            }        });        //确定按钮        dialog.findViewById(R.id.btn_sure).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                inputCode = edtInput.getText().toString().trim();                //校验验证码                if (TextUtils.isEmpty(inputCode)) {                    tvInfo.setText("请输入验证码!");                } else if (!verificationCode.equalsIgnoreCase(inputCode)) {                    tvInfo.setText("验证码错误");                } else {                    //校验成功                    dialog.dismiss();                }            }        });        //取消按钮        dialog.findViewById(R.id.btn_cancle).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                dialog.dismiss();            }        });        dialog.setCanceledOnTouchOutside(false);        dialog.show();    }}

其中TextActivity的布局文件就是一个button,设置onClick="showCodeView"的属性:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#0f0"    android:padding="20dp">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:onClick="showCodeView" /></RelativeLayout>

输入验证的码提示的2种状态:

1.未输入的情况下,点击确定,提示"请输入验证码!"

2.输入错误,提示"验证码错误"